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Primers selective for LTR-derived transcripts (L) or coding sequence (O) determined the breadth of LTR promoter use in all tissues in all organisms. In (A), L(form iii) primers were specific for the MER21C LTR-transcribed form and L(form ii) primers were specific for the HERV-P form. A GAPDH control is shown at the bottom of each panel.
